If the quilt is to be used regularly I coordinate the front and back. If the quilt will hang at my home, I really don't care much, but if it is a wallhanging for sale is coordinated too. On the other hand, I also take into consideration how I will quilt it. Whole cloth quilts get the exact same fabric on the front and the back. If I have complicated quilting I want to show, I will use a solid color coordinating with the front. If I don't want to show the quilting then I use something printed.